Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1665

Related
Documentation
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches
Requirements
Copyright © 2010, Juniper Networks, Inc.
If the PCs connected to Switch 2 send BPDUs to the interfaces again, BPDU protection
is triggered once more and the interfaces transition back to the BPDU inconsistent state.
In such cases, you need to find and repair the misconfiguration on the PCs that is triggering
BPDUs being sent to Switch 2.
Example: Configuring Faster Convergence and Improving Network Stability with RSTP
on EX Series Switches on page 1527
Example: Configuring BPDU Protection on STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1561
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches on page 1569
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches on page 1573
Understanding BPDU Protection for STP, RSTP, and MSTP on EX Series Switches on
page 1522
EX Series switches provide Layer 2 loop prevention through Spanning Tree Protocol
(STP), Rapid Spanning Tree protocol (RSTP), and Multiple Spanning Tree Protocol
(MSTP). Loop protection increases the efficiency of STP, RSTP, and MSTP by preventing
interfaces from moving into a forwarding state that would result in a loop opening up in
the network.
This example describes how to configure loop protection for an interface on an EX Series
switch in an RSTP topology:
Requirements on page 1569
Overview and Topology on page 1570
Configuration on page 1571
Verification on page 1572
This example uses the following hardware and software components:
Junos OS Release 9.1 or later for EX Series switches
Three EX Series switches in an RSTP topology
Chapter 65: Examples of Spanning-Tree Protocols Configuration
1569